LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded loan commitments	$ 90,370	$ 57,649	$ 57,649
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded loan commitments	4,200		4,100
Loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable on loans receivable	$ 23,800		$ 18,900